Check the listing for details. Antique Hygrometer German Brass Works Perfectly Tested. Condition: Used. Listed at 75.00 USD. This is a vintage brass cased "Präzisions Hygrometer" (Precision Hygrometer). The instrument measures the relative humidity of the air using a hygroscopic element, likely animal or human hair, which expands and contracts with moisture changes. The dial indicates relative humidity as a percentage, from 0 to 100. It is described as a precision instrument, often found in nautical or weather stations. The item in the image appears to be an older, collectible piece. Translation: Präzisions Hygrometer: Precision Hygrometer Prozente der relativen Feuchtigkeit der Luft: Percent of the relative humidity of the air
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